The Space Launch System produces more thrust at liftoff than the Saturn V, but the Saturn V carried more payload to the Moon. The Space Launch System generates 8.8 million pounds of thrust against 7.6 million pounds for Apollo’s rocket, while the Saturn V stood 41 feet taller and put 43,500 kilograms toward the Moon compared to 27 metric tons on Block 1.
Both vehicles are expendable NASA launchers built for lunar-class missions. The Saturn V flew between 1967 and 1973, while NASA’s Space Launch System (SLS) serves as the primary launcher sending the Orion spacecraft toward the Moon for the Artemis program.
The Short Answer: More Thrust, Less Payload
The Space Launch System produces more launch thrust than the Saturn V, but Saturn V sent more payload mass to the Moon. The answer depends on whether you measure performance by raw engine push off the pad or the weight pushed into deep space.
At liftoff, the SLS Block 1 generates 8.8 million pounds of maximum thrust. That is 15 percent more thrust than the Saturn V, which generated 34.5 million newtons (7.6 million pounds) of thrust from its five first-stage engines.
Payload numbers point in the opposite direction. The Saturn V delivered about 43,500 kilograms (roughly 50 tons) on translunar injection trajectories for Apollo. SLS Block 1 is rated to send more than 27 metric tons (59,500 pounds) to the Moon. The Saturn V also stood taller, measuring 111 meters (363 feet) compared to 322 feet for SLS Block 1. Both rockets share an expendable architecture, meaning every stage is discarded on every flight.
SLS vs Saturn V at a Glance
| Measure | SLS (Block 1) | Saturn V |
|---|---|---|
| Height | 322 feet | 363 feet (111 meters) |
| Fully Fueled Mass | 5.75 million pounds | 6.2 million pounds (2.8 million kg) |
| Liftoff Thrust | 8.8 million pounds | 7.6 million pounds (34.5 million N) |
| Moon Payload Capacity | More than 27 metric tons (59,500 lb) | About 43,500 kg (about 50 tons) |
| Earth Orbit Payload | Not given on NASA’s SLS page | About 118,000 kg (130 tons) |
| Stages | Core stage with two five-segment solid boosters (upper stage not detailed in the sources used here) | Three stages for lunar flights (two stages for Skylab) |
| Main Propulsion | 4 RS-25 liquid engines plus 2 five-segment solid rocket boosters | 5 F-1 engines on first stage |
| Operational Status | Active (flying in the Artemis program) | Retired after its last launch in 1973 |
| Flight Record | Artemis I (uncrewed) and Artemis II (crewed lunar flyby, April 2026) | 13 launches (1967 to 1973) |
Thrust and Liftoff Weight Compared
The SLS lifts off with higher total thrust and a lighter overall vehicle weight than the Saturn V. NASA lists the fully fueled mass of the SLS Block 1 at 5.75 million pounds, while the Saturn V weighed 6.2 million pounds (2.8 million kilograms) when loaded with propellants.
In our internal calculations, we compared the thrust-to-weight ratios of both vehicles at launch using NASA’s published figures, and readers can reproduce the arithmetic by dividing the listed liftoff thrust by the fueled liftoff weight. For the Saturn V, dividing 7.6 million pounds of thrust by 6.2 million pounds of weight yields a liftoff thrust-to-weight ratio of approximately 1.23. For the SLS Block 1, dividing 8.8 million pounds of thrust by 5.75 million pounds of fueled mass yields a thrust-to-weight ratio of approximately 1.53.
This gives the SLS Block 1 a higher liftoff thrust-to-weight ratio than the Saturn V. Dividing 8.8 million pounds by 7.6 million pounds yields a ratio of 1.158, confirming NASA’s published statement that the SLS produces roughly 15 percent more thrust at launch than the Saturn V. Both vehicles are featured in our guide covering the most powerful rockets compared.
Payload to the Moon and Definition Differences
The Saturn V delivered more mass toward the Moon than the initial version of the SLS can match. NASA records document that the three-stage Saturn V sent about 43,500 kilograms (50 tons) to the Moon, alongside an Earth orbit capability of about 118,000 kilograms (130 tons). By contrast, SLS Block 1 is rated to send more than 27 metric tons (59,500 pounds) on a translunar path.
In our internal calculations, dividing the SLS Block 1 payload rating of 27 metric tons by the Saturn V payload of 43.5 metric tons gives a ratio of 0.62. That shows the initial SLS carries approximately 62 percent of the lunar payload mass that Saturn V delivered on Apollo missions.
Direct payload comparisons between historical and modern rockets require a technical caveat. NASA payload figures across the two programs are not defined identically in every documentation set. Historical Apollo figures often cite translunar injection mass, whereas modern SLS specifications alternate between net mass to the Moon and total mass to deep space including the Orion spacecraft. Readers should treat direct payload ratios between the programs as close approximations rather than identical measurement envelopes.
Engines and Boosters: Five F-1s Against RS-25s and Solids
Propulsion systems define the structural differences between these two launch vehicles. The Saturn V used three stages for Apollo missions, with five F-1 engines powering its first stage.
The first stage of the Saturn V held five F-1 rocket engines, which NASA notes were the most powerful engines on the rocket. According to the Smithsonian National Air and Space Museum (NASM), each F-1 engine generated 1.5 million pounds of thrust, producing a combined 7.5 to 7.6 million pounds of thrust at launch. Readers can review how that powerplant operated in our guide on the F-1 rocket engine explained.
The SLS core stage takes a different path. The core stage is powered by four RS-25 engines. These four liquid engines do not lift the rocket by themselves. The core stage is flanked by two five-segment solid rocket boosters. NASA states that these two solid boosters provide more than 75 percent of the total vehicle thrust during the first two minutes of flight.
How Block 1B and Block 2 Change the Comparison
NASA designed the SLS architecture with planned evolutionary upgrades that change the numbers in this comparison over time.
Starting with Artemis IV, NASA plans to introduce the SLS Block 1B configuration. Block 1B introduces the Exploration Upper Stage. NASA documents state that SLS Block 1B will send 38 metric tons (84,000 pounds) to deep space including Orion. In our internal calculations, dividing 38 metric tons by 43.5 metric tons gives roughly 87 percent, an approximate figure that is not like-for-like (deep space including Orion against Saturn V’s translunar figure).
The ultimate planned configuration is SLS Block 2. NASA documents state that Block 2 will generate 9.4 million pounds of maximum thrust and send up to 46 metric tons (101,000 pounds) to deep space. In our internal calculations, dividing 9.4 million pounds of thrust by 7.6 million pounds shows that Block 2 will produce 24 percent more thrust than the Saturn V. At 46 metric tons to deep space, Block 2 would nominally pass the 43.5 metric ton figure for Apollo’s launcher, with the same like-for-like caveat.
Mission Roles Across Apollo and Artemis
The operational missions assigned to each vehicle explain why their payload allocations look different. The Saturn V flew 13 times between 1967 and 1973. Its final launch in 1973 was a two-stage variant flown without a crew that launched the Skylab space station. The Saturn V was subsequently retired.
The SLS fulfills a different mission architecture within the Artemis program. On Artemis I, the SLS Block 1 launched an uncrewed Orion spacecraft into an orbit that reached 38,000 miles beyond the Moon before returning to Earth. Artemis II followed as the first crewed Artemis flight, a lunar flyby that launched on April 1, 2026 and splashed down on April 10, 2026 (see Artemis 2 explained).
Our Takeaway: Thrust Favors SLS, Moon Payload Favors Saturn V
SLS Block 1 wins on thrust, and Saturn V wins on Moon payload and height. On raw liftoff power, the SLS Block 1 is the clear leader with 8.8 million pounds of thrust against 7.6 million pounds for the Saturn V. On physical size and historic payload delivery to the Moon, the Saturn V holds the advantage, standing 41 feet taller and sending 43,500 kilograms to lunar space against 27 metric tons on Block 1.
Our assessment is grounded entirely in NASA’s published technical specifications, Smithsonian documentation, and our direct mathematical calculations. The Saturn V remains a retired historical baseline whose operational flight envelope ended in 1973.
The primary condition that would change this comparison is NASA’s operational rollout of upgraded SLS variants. If NASA successfully flies the SLS Block 1B and Block 2 configurations, the payload gap could narrow or flip on NASA’s headline figures. Meanwhile, Starship remains unproven for crew and its reuse claims are design targets. To explore how other modern and historical heavy-lift vehicles compare, examine our guide to launch vehicles explained to track the evolving rocket landscape.